1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * h3xxx atmel micro companion support, notification LED subdevice 5 * 6 * Author : Linus Walleij <linus.walleij@linaro.org> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/platform_device.h> 11 #include <linux/mfd/ipaq-micro.h> 12 #include <linux/leds.h> 13 14 #define LED_YELLOW 0x00 15 #define LED_GREEN 0x01 16 17 #define LED_EN (1 << 4) /* LED ON/OFF 0:off, 1:on */ 18 #define LED_AUTOSTOP (1 << 5) /* LED ON/OFF auto stop set 0:disable, 1:enable */ 19 #define LED_ALWAYS (1 << 6) /* LED Interrupt Mask 0:No mask, 1:mask */ 20 21 static int micro_leds_brightness_set(struct led_classdev *led_cdev, 22 enum led_brightness value) 23 { 24 struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent); 25 /* 26 * In this message: 27 * Byte 0 = LED color: 0 = yellow, 1 = green 28 * yellow LED is always ~30 blinks per minute 29 * Byte 1 = duration (flags?) appears to be ignored 30 * Byte 2 = green ontime in 1/10 sec (deciseconds) 31 * 1 = 1/10 second 32 * 0 = 256/10 second 33 * Byte 3 = green offtime in 1/10 sec (deciseconds) 34 * 1 = 1/10 second 35 * 0 = 256/10 seconds 36 */ 37 struct ipaq_micro_msg msg = { 38 .id = MSG_NOTIFY_LED, 39 .tx_len = 4, 40 }; 41 42 msg.tx_data[0] = LED_GREEN; 43 msg.tx_data[1] = 0; 44 if (value) { 45 msg.tx_data[2] = 0; /* Duty cycle 256 */ 46 msg.tx_data[3] = 1; 47 } else { 48 msg.tx_data[2] = 1; 49 msg.tx_data[3] = 0; /* Duty cycle 256 */ 50 } 51 return ipaq_micro_tx_msg_sync(micro, &msg); 52 } 53 54 /* Maximum duty cycle in ms 256/10 sec = 25600 ms */ 55 #define IPAQ_LED_MAX_DUTY 25600 56 57 static int micro_leds_blink_set(struct led_classdev *led_cdev, 58 unsigned long *delay_on, 59 unsigned long *delay_off) 60 { 61 struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent); 62 /* 63 * In this message: 64 * Byte 0 = LED color: 0 = yellow, 1 = green 65 * yellow LED is always ~30 blinks per minute 66 * Byte 1 = duration (flags?) appears to be ignored 67 * Byte 2 = green ontime in 1/10 sec (deciseconds) 68 * 1 = 1/10 second 69 * 0 = 256/10 second 70 * Byte 3 = green offtime in 1/10 sec (deciseconds) 71 * 1 = 1/10 second 72 * 0 = 256/10 seconds 73 */ 74 struct ipaq_micro_msg msg = { 75 .id = MSG_NOTIFY_LED, 76 .tx_len = 4, 77 }; 78 79 msg.tx_data[0] = LED_GREEN; 80 if (*delay_on > IPAQ_LED_MAX_DUTY || 81 *delay_off > IPAQ_LED_MAX_DUTY) 82 return -EINVAL; 83 84 if (*delay_on == 0 && *delay_off == 0) { 85 *delay_on = 100; 86 *delay_off = 100; 87 } 88 89 msg.tx_data[1] = 0; 90 if (*delay_on >= IPAQ_LED_MAX_DUTY) 91 msg.tx_data[2] = 0; 92 else 93 msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100); 94 if (*delay_off >= IPAQ_LED_MAX_DUTY) 95 msg.tx_data[3] = 0; 96 else 97 msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100); 98 return ipaq_micro_tx_msg_sync(micro, &msg); 99 } 100 101 static struct led_classdev micro_led = { 102 .name = "led-ipaq-micro", 103 .brightness_set_blocking = micro_leds_brightness_set, 104 .blink_set = micro_leds_blink_set, 105 .flags = LED_CORE_SUSPENDRESUME, 106 }; 107 108 static int micro_leds_probe(struct platform_device *pdev) 109 { 110 int ret; 111 112 ret = devm_led_classdev_register(&pdev->dev, µ_led); 113 if (ret) { 114 dev_err(&pdev->dev, "registering led failed: %d\n", ret); 115 return ret; 116 } 117 dev_info(&pdev->dev, "iPAQ micro notification LED driver\n"); 118 119 return 0; 120 } 121 122 static struct platform_driver micro_leds_device_driver = { 123 .driver = { 124 .name = "ipaq-micro-leds", 125 }, 126 .probe = micro_leds_probe, 127 }; 128 module_platform_driver(micro_leds_device_driver); 129 130 MODULE_LICENSE("GPL"); 131 MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds"); 132 MODULE_ALIAS("platform:ipaq-micro-leds"); 133